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This paper reviews some of the techniques used for the identification of unknown lumped time delays in single input, single output (SISO) control systems and evaluates a number of these techniques in simulation and in implementation. Both off line and on line identification techniques are considered.
O'Dwyer, Aidan : A comparison of techniques for time delay estimation. Proceedings of the Irish Colloquium on DSP and Control, pp. 231-238, University College Dublin, June, 1993. doi:10.21427/q11y-ty04